C norrls peters co



(No Model.)

A. GRAF. HEATER.

No. 485,190. Patented Nov. 1, 1892.

m: NORRIS Pmws on Pno'rauma. WASHINGTON, n. c.

UNITED STATES PATENT OEEIcE.

ANTON GRAF, OF GEORGETOWN, MASSACHUSETTS, ASSIGNOR OF ONE-HALF TOSTEPHEN OSGOOD, OF SAME PLACE.

HEATER.

SPECIFICATION forming part of Letters Patent No. 485,190, dated November1, 1892.

Application filed June 6, 1892. Serial No. 435.621. (No model.)

To all whom it may concern: the dome. A manhole leads into the top of Beit known that I, ANTON GRAF, of Georgethe box D. The furnace-front isprovided town, in the county of Essex, State of Massawith the usualdoors 2 5 Above the grate chusetts, have invented certain new and useband the top y of the wall g a series of U- 5 ful Improvements inHeaters, of which the shaped pipes 11 are secured in the top h offollowing is a description sufficiently full, the fire-box by check-nutsl5. (Shown in Fig. clear, and exact to enable any person skilled 3.)Both ends of said pipes open within the in the art or science to whichsaid invention dome C. At the mouth of the flue 7s a box appertains tomake and use the same, refer- 16 is mounted in the furnace, said boxhav- 6o [0 ence being had to the accompanying drawing a discharge-nipple17, opening above the ings, forming part of this specification, in coilE. This box is designed to contain any Which oxygen-producingcompound-as, for exam- Figure l is a side elevation, partly in secple,permanganate of potash, black oxide of tion, of my improved heater; Fig.2, a front manganese,,or other similar substance, which 6 :5 endelevation of the same; Fig. 3, an enlarged mayor may not be mixed withan acid. The elevation of one of the circulation-tubes, and heat fromthe fire-box passing through the Fig. 4 an elevation of the oxygen boxand flue causes the compound to give off oxygen, guard. V which isdischarged through the nipple 17 Like letters and figures of referenceindiinto the rear box D. A protecting-slide 18 is 2o cate correspondingparts in the diiferent figarranged under the box, and maybe manipuuresof the drawings. lated through the furnace-wall by any desired Myinvention relates especially to a hotmeans. Said slide has anupwardly-turned water and steam-heater; and it consists in lip 19adjacent the fire-box, and is provided certain novel featureshereinafter fully set on its inner face with protecting-lining 20, 25forth and claimed, the object being to produce (indicated by a blackline in Fig. 4,) which is a simpler, cheaper, and more effective deviceconstructed of insulating material. By maof this character than is nowin ordinary use. nipulating this slide laterally of the box the Thenature and operation of the improvebottom thereof may be protected in aproporment will be readily understood by all cont-ionate degree from theflame of the fire-box. 8o versantwith such matters from the followingWhen the fires are dampened in the furexplanation. nace, so that theflame or sufficient heat to In the drawings, A represents the furnaceeffect the compound in the box will not igof the heater considered as awhole, which is nite the discharge of oxygen, I provide an provided witha firebox B, having a grate b, inflammable gas, which is generated froma supported by lugs d on the front fand back mineral oil contained in abox 25 at the front wall g of the furnace. On the top h of the of thefurnace outside,or where it will be subfurnace there is a dome-shapedchest 0, from ject to a mild degree of heat. Said oil being the apex ofwhich the discharged leads. The of a light volatile nature, I conductthe same back wall 9 is elongated vertically at j in its by a pipe 26,which opens at 27, adjacent the 40 rear portion,leaving a narrow flue itbetween mouth of the nipple 17, within the box D. As the top and suchelongation. Said flue leads such gas is of a highly-inflammable nature,it into the top of a box D at the rear of the furreadily ignites fromthe heat from the firenace. The stack m opens into the bottom of box.Water being admitted to the supply said box. Afeed-water-heating-coil ofpipeE and fire started in the grate, the full force of is disposed inthe box D, the supply 10 for said the heat is drawn against the U-shapedpipes pipe opening through the wall of the box at H, creating anindependent circulation in the bottom. A T-coupling valve q is in theeach of said pipes and the dome. The heat supply, and the return 1'leads into said couppassing through the hue 7c and drawn downling. Thecoil discharges through a pipe T ward to enter the stock on superheatsthe wa- Ioo 50 outside the box leading into the dome at o. ter in thefeed-water-heating coil E, deliver- An ordinary gage-glass w isconnected with ing it to the dome C in such condition. By

means of the oxygen and gas, generated as described, this heat may beintensified to any desired degree and maintained when the fire on thegrate is low. Moreover, When the device is used for hot-Water heating,the water being discharged from the dome-pipe 2' is returned through thereturn-pipe rdirectly into the coil and again superheated, maintaining aconstant rapid circulation.

The same device is applicable for steamheating by reducing the amount ofwater in the dome to allow for steam space. The amount of fuel necessaryto the proper heating of the water or generating of the steam is greatlyreduced by my improved arrange ment.

It will be understood that the oxygen-generator and gas apparatusdescribed may be applied to other forms of furnaces for superheating thesupply before delivery to the boiler.

Having thus explained my invention, What I claim is- 1. The furnace A,provided With the box D, having the stack m, and the Wall g, incombination with the dome O, the feed-waterheating coil E, disposedbehind said wall and opening into said dome, the flue 70 at the top ofsaid Wall, and a receptacle for containing an oxygen-generating compounddisposed adjacent said flue and opening against said coil substantiallyas described.

2. In a heater, a furnace and steam or water dome, in combination with acirculation feed-Water-heating coil disposed in said furnace between itsfire-box and stack, and a receptacle for containing an oxygen-genera ting compound disposed adjacent said coil.

3. The furnace A and dome O,in combination with the supplyfeed-Water-heating coil E, leading into said dome, and an apparatusdisposed Within the furnace adjacent said coil for generating oxygen andan inflammable gas by the heat from the fire-box, substantially asdescribed.

4. The furnace A, provided with the flue lo and stack m, in combinationwith the dome O, the feed-Water-heating coil E, opening into said dome,the receptacle 16, disposed adja cent said flue and opening against saidcoil, and the shield orguard 18 for said receptacle, all being arrangedto operate substantiallyas described.

5. The combination, with the furnace A, dome O, and circulationfeed-Water-heating coil, of the oxygen-generating receptacle 16, havinga discharge-opening against said coil, and the oil-tank 25, having thedischargeopening adjacent the ox ygen-discharge, substantially asdescribed. g

6. The combination, with a furnace and boiler, of a supply-pipe for saidboiler, disposed in the furnace in the draft from its firebox, and anoxygen-generating compound so disposed that the oxygen given oif willbeignited by the heat from said box and superheat said supply.

7. The combination, With a furnace and boiler, of asupply-pipe for theboiler, passing through the fire-box draft, an oxygen-generator disposedadjacent such supply-pipe, and an inflammable gas-generator, all beingarranged substantially as described.

ANTON GRAF.

Witnesses:

K. DURFEE, O. M. SHAW.

